You could do it if your second hilt is a warrior, you just need to set your blade flicker on the champion to "1" setting. That way you won't have one blade flickering and one solid.
The only advantages of having both of them be champions would be if you really wanted the blade flicker and the extra hum and swings. It actually will sound more like Maul's saber if you have two, if you listen carefully, there is a double swing sound, one overlapping the other a fraction of a second behind.
If you are tight for cash, go warrior. You can always upgrade it later.